When you have more money than you know what to do with, it might not seem like a big deal to spend $US8 million on a preserved shark, $US2.2 million on a gold bathtub, or millions more on luxurious superyachts and private islands.

Perry bought a $US200,000 Virgin Galactic ticket as a birthday gift for her now ex-husband Russell Brand in 2010.

Branson said in May 2018 that Virgin Galactic was two or three test flights away from taking passengers to space.

2. Fossils

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When money is no object, what’s a few hundred thousand dollars spent on the remains of a long-dead creature? In 2007, Nicolas Cage outbid Leonardo DiCaprio for a $US276,000 Mongolian dinosaur skull. The skull turned out to be stolen, so Cage later had to give it to US authorities.

In 2014, billionaire hedge fund manager Steve Cohen bought a 14-foot preserved shark for between $US8 million and $US12 million.

3. Gold toilets and bathrooms

One way to show that you’re ultra-wealthy is to surround yourself with as much gold as possible. A Hong Kong jeweller spent $US3.5 million building a bathroom made entirely of gold and precious jewels, including a 24-carat solid gold toilet.

The actor-turned-activist, who’s worth an estimated $US29 million, has been building an eco-resort on the island, which will be powered by 100% renewable energy and is set to open at the end of 2018.

5. Luxurious superyachts

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Some of the world’s wealthiest people are owners of superyachts. Russian billionaire Roman Abramovich bought his yacht, Eclipse, in 2010. Reports of its cost vary, ranging from $US600 million up to $US1 billion.

The Eclipse has two helipads, a missile defence system, two swimming pools, a cinema, hair salon, and restaurant.

Entertainment mogul David Geffen owns a $US590 million superyacht know as the Rising Sun, which includes a basketball court and space for 18 overnight guests. In April 2017, Geffen hosted the Obama family on his yacht.

Sheikh Khalifa bin Zayed Al-Nahyan, president of the United Arab Emirates, owns the world’s largest motor yacht, which is 590 feet long and cost $US600 million to build.

6. Private planes

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Private planes are another luxury on which the super-wealthy love to splurge. In 2007, Prince Alwaleed bin Talal of Saudi Arabia spent $US319 million for a double-decker superjumbo jet nicknamed “The Flying Palace,” made renovations that put the value at more than $US500 million, and then promptly sold it to an unknown buyer.

Jeff Bezos, the richest man in the world, owns a $US65 million Gulfstream G650ER private jet.

7. Movie props and memorabilia

If you had millions (or billions) of dollars to spare, would you buy props and other paraphernalia from your favourite films? Many do just that. In 2013, Elon Musk bought the Lotus Esprit car from James Bond’s “The Spy Who Loved Me” for $US886,000.

In the movie, the car turns into a submarine. “I was disappointed to learn that it can’t actually transform. What I’m going to do is upgrade it with a Tesla electric powertrain and try to make it transform for real,” Musk said.

8. Massive car collections

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Many of the world’s wealthiest people like to collect cars. Bill Gates is an avid luxury car collector, with his first big splurge after founding Microsoft being a Porsche 911 supercar. He has various garages that fit 23 cars.

Perhaps unsurprisingly, Tesla CEO Elon Musk has owned many different vehicles in addition to his James Bond submarine car. His past cars include an Audi Q7, a Porsche 911, a 1967 E-Type Jaguar, and a Hamann BMW M5 sports car.

9. An entire town

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If an island isn’t your thing, you can always buy a town, like Kim Basinger did in 1989. With other investors, she bought 1,751 acres of the 2,000-acre town of Braselton, Georgia, for $US20 million. She wanted to turn the town’s farmland into a tourist attraction and film studio, but it was later auctioned off as part of her bankruptcy.

10. Second passports

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Yet another mark of the wealthy comes in the form of second passports. “It’s a status symbol — it shows friends you can afford it,” Nuri Katz, president of international financial firm Apex Capital Partners, told Business Insider. “I call it the black American Express syndrome.”

Many countries, including the US, require you to meet certain criteria before obtaining citizenship. But in others, including Austria, Cyprus, Malta, Turkey, and certain Caribbean islands, you can simply buy it — for a minimum $US100,000.